Internal-combustion engine.



R. BURN.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED APR.25.191&

Patented Oct. 27, 1914.

ROBERT BURN, OF PETONE, NEW ZEALAND.

INTERNAL-COMBUSTION ENGINE.

Specification of Letters Patent.

Patented oet. 27, 1914.

Application filed April 25, 1913. Serial No. 763,512.

other end for end.

The object of the invention is primarily to provide an improved construction in which the water is led to and from the outside source of supply, thus permitting the charge being highly compressed without incurring the liability of pre-ignition, with the advantage that any leakage through stufling glands drips clear of the crank case.

In order that the nature of the invention and the construction may be understood, ref-- erence will now be made to the following drawings by way of example, in which,

Figure 1 is an elevation partly in section, showing the invention applied to a four stroke cycle engine, and Fig. 2 is a sectional plan view illustrating in diagrammatic form the system of water-cooling the piston.

1 and 2 are a pair of cylinders disposed in line with one another end-fo1end and united at their adjacent open ends by a central crank-case 3. A

The piston comprises a pair of heads 4 and 5 adapted to reciprocate in the cylinlders 1 and 2 respectively, such heads being rigidly connected together end-for-end by means of an intermediate connecting member so as to constitute a single piston adapted to receive an impulse alternatively at either end. The said intermediate connect ing .member as here shown consists of two rods 6 and 7 which are secured at either extremity to the piston heads 4 and 5. The said member ma however comprise any desired number o lrods or a single bod in which latter case suitable slots wil be formed in the member to provide the necessary clearance for the crank and crank-shaft to operate. A. crank-shaft 8, 'having a single crank 9, is rotatably mounted within the crank-case 3 and the piston is connected with such crank by means of a single connecting rod 10, a gudgeon-pin 11 being arranged for this purpose eithe'r upon the interior of one of the piston heads 4 or 5 or carried upon the said intermediate connectng-member of the piston.

For the purpose of water-cooling, the piston heads and 5 are provided with cavities 12 and 13 respectively adapted to contain water, which is supplied and caused to circulate from an external source, by means of passages or water-ways 14, 15 and 16 formed in the rods 6 and 7 and communicating at either end with the cavities 12 and 13 by means of pipes or passages 17, 18, 19 and 2O arranged in the interiors of the pistonheads. To provide communication between this water system in the piston and an external supply, upon the intermediate portion of the rod 6 is arranged an outwardly projecting T-piece 21 carrying two pipes 22 and 23 which are disposed parallel with the piston and, which are connected at their inner ends with the water-ways 14 and 16 respectively by passages 24 and 25 formed in the T-piece 21. The outer ends of the said pipes 22 and 23 are connected respectively with fixed pipes 26 and 27 by means of glands 28 and 29 provided one at either end of the crank-case 3, which arrangement allows of such pipes 22 and 23, as they reciprocate with the piston, telescoping within the fixed pipes 26 and 27. By this arrangement water from a cooling-tank or other external source is supplied through the pipe 26 to the reciprocating pipe 22and from thence through lthe passages 24 14 and 17 to the cavity 12. From the said cavity 12 the water passes through the passages 18, 15 and 19 to the cavity 13 and from thence it returns through the passages 20, 1-6.and 25 and the pipes 23 and 27. In order to facili tate this circulation of the water, non-return valves 30 and 31 may be placed in the pipes 26 and 27 so that pipes 22 and 23 as they reciprocate will actas a ump and asn sist, the {iow of the water. he result is a uniform and smooth circulation of the water through the water jackets of the pistons, the speed of which rises and falls directly with the number of revolutions of the engine.

In all cases provision may be made for water-jacketing or air cooling the exterior of the cylinder and valve-gear if such is thought desirable.

lIt will be understood that the invention is equally applicable to internal combustion engines working on the twostroke cycle. 

